Some FAQ questions

Some FAQ questions

[Damjan]

I have some questions for the FAQ, about the configuration of Linux guests:
 a) is swap needed in the guest (I'd say no, but..)
 b) what filesystem is best for a guest
 c) what io scheduler in the guest (noop? or cfq)
 d) are there any runtime kernel tweaks for the guest (/proc/sys)?
 e) suggested linux kernel source configuration (.config)?



-- 
damjan | дамјан
This is my jabber ID -->         damjan@bagra.net.mk 
 -- not my mail address, it's a Jabber ID --^ :)

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Re: Some FAQ questions

[Avi Kivity]

Damjan wrote:
> I have some questions for the FAQ, about the configuration of Linux guests:
>  a) is swap needed in the guest (I'd say no, but..)
>  b) what filesystem is best for a guest
>  c) what io scheduler in the guest (noop? or cfq)
>  d) are there any runtime kernel tweaks for the guest (/proc/sys)?
>   

For the first four questions, do whatever you'd do for a similarly 
configured host running a similar workload.  It's fine to use cfq as the 
I/O scheduler.

>  e) suggested linux kernel source configuration (.config)

With newer kernels, be sure to enable virtio drivers, kvm clock, and kvm 
mmu paravirtualization.

-- 
error compiling committee.c: too many arguments to function


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Re: Some FAQ questions

[Luca Tettamanti]

On Tue, Apr 22, 2008 at 1:10 PM, Avi Kivity <avi@qumranet.com> wrote:
> Damjan wrote:
>  > I have some questions for the FAQ, about the configuration of Linux guests:
>  >  a) is swap needed in the guest (I'd say no, but..)
>  >  b) what filesystem is best for a guest
>  >  c) what io scheduler in the guest (noop? or cfq)
>  >  d) are there any runtime kernel tweaks for the guest (/proc/sys)?
>
>  For the first four questions, do whatever you'd do for a similarly
>  configured host running a similar workload.  It's fine to use cfq as the
>  I/O scheduler.

Is cfq still fair in the guest? The VM re-dispatches the requests (at
least when using QEMU IDE) and the host can reschedule them at will.

Luca

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Re: Some FAQ questions

[Avi Kivity]

Luca Tettamanti wrote:
> Is cfq still fair in the guest? The VM re-dispatches the requests (at
> least when using QEMU IDE) and the host can reschedule them at will.
>   

The same problem occurs (to a lesser extent) in non-virtualized 
environments; disks (and esp. array controllers) also have their own I/O 
schedulers.

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error compiling committee.c: too many arguments to function


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